mtools is a collection of utilities that supports accessing
DOS disks without mounting them.  It can be found at
ftp://ftp.tux.org/pub/tux/knaff/mtools/.
See also http://www.tux.org/pub/tux/knaff/mtools/index.html

A graphical interface for mtools can be found at:
http://www.core-coutainville.org/MToolsFM/